A citizen of India, who is absent from the country owing to employment, education etc, and has not acquired citizenship of any other country are known as Overseas Voters and are eligible to be registered as a voter in the address mentioned in their Indian passport. 

1. You Can enroll as an NRI Voter or Overseas electors if you are

2. a citizen of India, absent from the country owing to employment, education etc, has not acquired citizenship of any other country and are otherwise eligible to be registered as a voter in the address mentioned in your passport.

3. Use this interactive map to find your polling station and the contact details of Election Officers from your area.

4. Fill Form 6A online at https://voterportal.eci.gov.in/ and upload the requisite proofs.

5. Alternatively download Form 6A from ECI website www.eci.gov.in. Fill Form 6A in 2 copies. Forms are also available free of cost in Indian Missions.

6. One recent passport size coloured photograph affixed in Form 6A.

7. Self attested photocopies of the relevant pages of the passport containing photograph, address in India and all other

8. The page of passport containing the valid visa endorsement

9. If the application is sent by post, the photo copy of each of the documents referred to above, should be duly self attested.

10. Alternatively you can fill the form in person at the Electoral Registration Officer / Assistant ERO of the constituency. If application submitted in person before the ERO, the original passport should be produced for verification

11. Booth Level Officer will visit the home address mentioned in your passport and enquire to verify the copies of documents

12. In cases where no relative is available or willing to give declaration for verification of documents, the documents will be sent for verification to the concerned Indian Mission

13. Decision of the ERO will be communicated to you by post on the address and SMS on the mobile number given in Form 6A. Electoral rolls are also on the website of the Chief Electoral Officer

14. Name of overseas elector is included in a separate section for “Overseas Electors” which is the last section of the roll of each polling station area

15. You can use Form-8 for making any correction in electoral roll

16. If the case of shifting of residence ( within the same Constituency or in different Constituency) , fill Form 8 online for download Form 8 download Form 6 and submit to the ERO of the area of your new residence

17. It is not necessary to get address changed in your old EPIC. However, if you want to change address in EPIC, it can be done on payment of Rs. 25 with an application to Electoral Registration Officer of the new constituency. The EPIC with new address will carry the same EPIC no as the old one

18. An overseas elector is not issued an EPIC & you will be allowed to vote in person at the polling station (in India) on production of your original passport.

19. No person can be enrolled on more than one electoral roll i.e. when you enrol as a overseas voter you have to submit a declaration - that you did not get enrolled as a general elector

20. If you are registered as a general voter, you should surrender your EPIC alongwith submission of Form 6A

21. When you return to India you can register as general elector at your place of ordinary residence

22. Please remember that you have only one vote. Accordingly you should not vote for more than one candidate
    

As can be seen from above that Embassy has no role in the entire process; neither is there any requirement for the NRI / overseas voter to contact / approach Embassy directly.